Auto-reverse tape deck comprising a switching device

Abstract

The invention relates to a switching device in an auto-reverse deck for a magnetic-tape-cassette apparatus, comprising a drive mechanism which is pivotable in a pivoting range between a first and a second reel-disc wheel (51, 52), by means of which drive mechanism the first reel-disc wheel (51) is drivable in a first operating position of the switching device for a first tape-transport direction and the second reel-disc wheel (52) is drivable in a second operating position of the switching device for a second tape-transport direction, the drive mechanism acting upon a movably supported actuating lever (5) during the pivotal movement between the two operating positions and a pivotal lever (44) being provided which carries a pivotal wheel (50), and the pivotal lever (44) being coupled to an intermediate wheel (41), particularly by means of a friction coupling (45), which intermediate wheel meshes with the pivotal wheel (50). In order to enable switching over with a high power in a larger angular range, the actuating lever (5) has teeth (11) which are engageable with the pivotal wheel (50) mounted on the pivotal lever (44) of the pivotable drive mechanism, a pivotably supported armature lever (15) has been provided whose pivotal movement is controlled by the movement of the actuating lever (5), the pivoting pivotal lever (44) engages against a stop edge (17, 18) of the armature lever (15) in the central part of the pivoting range, so that subsequently, owing to the engagement of the pivotal lever (44) against the stop edge (17, 18) of the armature lever (15), meshing forces are transmitted to the teeth (11) of the actuating lever (5) by means of the intermediate wheel (41) and the pivotal wheel (50), as a result of which said actuating lever is pivoted.

We claim: 
     
       1. A switching device in an auto-reverse deck for a magnetic-tape-cassette apparatus, comprising a drive mechanism which is pivotable in a pivoting range between a first and a second reel-disc wheel, by means of which drive mechanism the first reel-disc wheel is drivable in a first operating position of the switching device for a first tape-transport direction and the second reel-disc wheel is drivable in a second operating position of the switching device for a second tape-transport direction, the drive mechanism acting upon a movably supported actuating lever during the pivotal movement between the two operating positions and a pivotal lever being provided which carries a pivotal wheel, and the pivotal lever being coupled to an intermediate wheel particularly by means of a friction coupling, which intermediate wheel meshes with the pivotal wheel, in which: the actuating lever has teeth which are engageable with the pivotal wheel mounted on the pivotal lever of the pivotable drive mechanism, a pivotably supported armature lever has been provided whose pivotal movement is controlled by the movement of the actuating lever, the pivoting pivotal lever engages against a stop edge, of the armature lever in the central part of the pivoting range, so that subsequently, owing to the engagement of the pivotal lever against the stop edge of the armature lever, meshing forces are transmitted to the teeth of the actuating lever by means of the intermediate wheel and the pivotal wheel, as a result of which said actuating lever is pivoted.   
     
     
       2. A switching device as claimed in claim 1, characterized in that the actuating lever is supported on a carrier element which is mounted on a deck plate and on which a magnetic head can be mounted, and the actuating lever is movable out of the pivoting range of the pivotal lever by movement of the carrier element. 
     
     
       3. A switching device as claimed in claim 1, characterized in that the actuating-lever teeth have been provided on an end face of the actuating lever and the direction of movement of the pivotal lever and the direction of movement of the actuating lever are oriented substantiality parallel to one another in the central part of the pivoting range. 
     
     
       4. A switching device as claimed in claim 1, characterized in that the armature lever is pivotably supported on a deck plate. 
     
     
       5. A switching device as claimed in claim 1, characterized in that the armature lever comprises a guide element which engages in a guide opening in the actuating level or the actuating level has a guide element which engages in a guide opening in the armature lever. 
     
     
       6. A switching device as claimed in claim 5, characterized in that the guide opening in the actuating lever having two parts of different width, the width of the slot in a narrow first part corresponding substantially to the width of the guide element and the width of the slot in a broad second part being larger than the width of the guide element. 
     
     
       7. A switching device as claimed in claim 1, characterized in that the actuating lever actuates a switching mechanism by means of which a first pressure roller for a first tape-transport direction can be applied to a first capstan and a second pressure roller for a second tape-transport direction can be applied to a second capstan.